Bullhead · Cottus gobio

Bullhead in the Pix Brook

Largest measured bullhead: 9.5 cm

The largest bullhead measured in Environment Agency surveys of the Pix Brook was 9.5 cm, recorded at Church End Arlesey on 18 April 2016.

Across 27 measured bullhead, the median measured length was 6.5 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Pix Brook.

See bullhead records across England →

Most recent observation8 May 2025Church End Arlesey · 1 fish

Largest measured bullhead: 9.5 cm
Median length: 6.5 cm
Fish measured: 27
Survey locations: 4

Individual EA measurements

Largest measured bullhead

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

Length	Survey date	Survey location	Survey ID
9.5 cm	18 Apr 2016	Church End Arlesey	147943
9.2 cm	18 Apr 2016	Church End Arlesey	147943
8.6 cm	8 May 2025	Church End Arlesey	176551
8.5 cm	28 Apr 2022	Church End Arlesey	160912
8.2 cm	18 Apr 2016	Church End Arlesey	147943
7.9 cm	18 Apr 2016	Church End Arlesey	147943
7.6 cm	18 Apr 2016	Church End Arlesey	147943
7.4 cm	18 Apr 2016	Church End Arlesey	147943
7.3 cm	18 Apr 2016	Church End Arlesey	147943
7.2 cm	18 Apr 2016	Church End Arlesey	147943

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where bullhead were found

Each point marks a survey location with at least one bullhead record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyed	First recorded	Last recorded	Visits finding bullhead
Church End Arlesey	19 Jan 2010	8 May 2025	4
Stotfold	19 Jan 2010	19 Jan 2010	1
Letchworth STW	19 Jan 2010	19 Jan 2010	1
DS Stotfold	19 Jan 2010	19 Jan 2010	1

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2010–2025

Survey records by year

Each bar shows how many survey visits recorded bullhead that year.

410

011

012

013

014

015

116

017

018

019

020

021

122

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 27 measured fish were spread across different length ranges.

Smallest: 4.4 cm
Lower quarter: 6 cm
Median: 6.5 cm
Upper quarter: 7.5 cm
Largest: 9.5 cm

0–99 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Pix Brook

Compare other species with enough survey and measurement data for a detailed page.

Chub Stone loach Minnow

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →